. >> but bill clinton is flying separately with chelsea from another location. he presumably has his own plane. jimmy carter and his wife are flying over separately with a group of so-called elders, so that will be a separate plane for them. but all four of those presidents, one current, three former presidents and their wives, they will all presumably be at this memorial service. you were saying the secret service has got to be worried about a situation like that, and even though the south african security forces have been preparing for years, literally, for this day, they've got to be extremely nervous. >> look, the mandela inauguration back in 1994 was a who's who of world leaders as well and went off without a hitch. it was a very emotional, dramatic event. i just spoke to a federal law enforcement source who says of course there's a bit of nervousness but they think they are in good position here. you have support planes, groups that have already gone over, there will be plain clothes people in the crowd and all that. think of the fascinating moment for the